StTest/MyTests/Pages/TestPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace MyTests.Pages
{
    public partial class TestPage : Page
    {
        int testId;
        Tests test;
        public TestPage(int id)
        {
            InitializeComponent();
            testId = cnt.db.Tests.Where(item => item.IdTest == id).Select(item => item.IdTest).FirstOrDefault();
            test = cnt.db.Tests.Where(item => item.IdTest == id).FirstOrDefault();
            LoadingQuestions();
        }
        void LoadingQuestions()
        {
            TestsListBox.Items.Clear();
            TestsListBox.ItemsSource = cnt.db.Questions.Where(item=>item.IdTest == testId).ToList(); ;
        }
    }
}